Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a26d1ecfe81c38b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 11:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 220968b305eec58fb769bfe119a62a16 SHA-1: bc7aced2627d92e7e728ce463566d868aa6d0469 SHA-256: 8a26d1ecfe81c38bcaa5b8ad63b4b5b3effdcfd7943d4df60be96585fd1bae7b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One prominent URL, fokemale.ru, is likely part of the malicious infrastructure. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/strik?utm_term=school+wide+positive+behavior+support+plan+example PDF link annotation
    • https://ruwefenoref.weebly.com/uploads/1/3/0/7/130739117/507e2bf80.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/tavewakadaw_kokolojibujib_nejoli_zitigizegimufop.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/research_design_creswell_5th_edition.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/8663922.pdfIn PDF document text
    • http://fukoramilani.22web.org/60541081310.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/90463699552.pdfIn PDF document text
    • http://fusitekive.iblogger.org/36130091578.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/17195279447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_a6c2562a73f24516a3ed3cd037759394.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_ef4d4262894749deb18de8be6665301a.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_32f6e37b79bc4a19a07c22d444de0e84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1933175d-6eb6-4b4e-ae8b-46e1b782c0f6/wikelola.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_3b02dcf0b2e04636a199d974161fa3ed.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_0b4d7d5135aa4da5bc90a8307be6484b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4140965d-b5ab-4fff-a752-088183104cdc/mackie_control_universal_manual_espaol.pdfIn PDF document text
    • http://badiwoxot.rf.gd/acr_form_delhi_govt.pdfIn PDF document text
    • http://xeligelejo.rf.gd/28982523000.pdfIn PDF document text
    • http://dexegesen.rf.gd/anacalypsis_godfrey_higgins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b415ae2e-cc43-473f-b3aa-1ec8304cf517/bible_quotes_for_the_blind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a615bcf6-769a-4931-8dd5-a8676128c4df/6556716866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7724f14a-2aab-42b5-8fba-4d7557dcf243/storytellers_guide_to_the_sabbat.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_0c2dffd05ead43f5b53f0e2a643a25b4.pdf?index=trueIn PDF document text
    • http://tosurok.myartsonline.com/vopibatonawokof.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 5776 bytes
SHA-256: 833ae57645e9b4c047a27e35a3cd91773494f48beef080b8ca23ec5ad1ad1a4d
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10740 bytes
SHA-256: 831f1a8afc0f9e59f828ef792a03e216f45c7cf56a00ff037ce975e6351a279d